Add Kubelet config, remove deprecated flags and fix minor bugs (#4724)

* Add kubelet config

* Change kubelet_authorization_mode_webhook to true

* Fix lint

* Sync env file

* Refactor the kubernetes node folder

* Remove deprecated flag and fix lint

roles/kubernetes/node/templates/kubelet.service.j2

@@ -0,0 +1,27 @@
+[Unit]
+Description=Kubernetes Kubelet Server
+Documentation=https://github.com/GoogleCloudPlatform/kubernetes
+After=docker.service
+Wants=docker.socket
+
+[Service]
+User=root
+EnvironmentFile=-{{ kube_config_dir }}/kubelet.env
+ExecStartPre=-/bin/mkdir -p {{ kubelet_flexvolumes_plugins_dir }}
+ExecStart={{ bin_dir }}/kubelet \
+		$KUBE_LOGTOSTDERR \
+		$KUBE_LOG_LEVEL \
+		$KUBELET_API_SERVER \
+		$KUBELET_ADDRESS \
+		$KUBELET_PORT \
+		$KUBELET_HOSTNAME \
+		$KUBELET_ARGS \
+		$DOCKER_SOCKET \
+		$KUBELET_NETWORK_PLUGIN \
+		$KUBELET_VOLUME_PLUGIN \
+		$KUBELET_CLOUDPROVIDER
+Restart=always
+RestartSec=10s
+
+[Install]
+WantedBy=multi-user.target